There was some instability in watch app 1.5.4. Hopefully fixed in 1.5.4a In Glance 0.10 the hourly vibrate setting (in Customise Watch) can incorrectly look like it is off when it is on. Switching the setting On and Off should resolve the issue. The tap Refresh Data to make sure your Pebble has the setting. Apologies for the inconvenience.